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Layer-Spacing-Enlarged MoS2 Superstructural Nanotubes with Further Enhanced Catalysis and Immobilization for Li-S
Yuelei Pan1, Lunlun Gong1, Xudong Cheng1
1State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230027, P.R. China.
Abstract:
A layer-spacing-enlarged MoS2 nanotube (LE-MoS2) consisting of hierarchical superstructural nanosheets (-MoS2-carbon layer-MoS2-) was fabricated and served as the sulfur host. The (002) lattice plane of LE-MoS2 is greatly expanded to 1.04 nm and 67.7% higher than that of the conventional 2H-MoS2. Benefitting from the layer-spacing-enlarged hierarchical superstructure of LE-MoS2, the catalytic effect on the S(s)-Li2S (soluble, x > 6)-Li2S (soluble, y > 2)-Li2S(s) phase transformation kinetics and immobilizing effect on the soluble Li2S in Li-S batteries are both further enhanced and demonstrated by in situ X-ray adsorption near-edge structure spectroscopy and first-principles calculations. The formation of hierarchical superstructural nanosheets was carefully investigated by customized synchrotron vacuum ultraviolet photoionization mass spectrometry.
